Why are portrait and macro lenses always fixed?

I went out and bought a Nikon 50mm portrait lens and was wondering, why are specialty lenses like portrait and macro always fixed?

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Distortion with ultra wide lenses?

i went to Best buy and bought a Tamron 10 to 24 ultra wide for my D7100, a more cost effective alternative to the Nikon version i was looking at
anyway, i like the pics i take with it although i do notice some distortion, like "stretching" at the widest angles
check out the attached pic as an example, the outer parts of the pic seem stretched in a way
its not a biggie to me, i kinda like the different way it makes the pics look
but i was wondering if this was common with ultra wide angle lenses?

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Sunpak Auto 144D Thyristor work for D5000?

Will the flash noted above work with my Nikon D5000?

I hear that some flashes if they aren't compatible will ruin your camera so I just want to be sure.

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External flash for nikon d3200?

I have a nikon d3200 and the pop up flash works ok, but im searching for an external flash the will hook to my camera. I am a beginner photographer at some of my local dirt tracks and their lighting is always different. Any suggestions on which flash would work best?

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Which camera is best under Rs.25k (cannon or Nikon)?

Which camera is best under Rs.25k (cannon or Nikon)?
Added (1). My choice is NIkon D3200…
What's Your Choice
Rs.25000 = $406.108
Added (2). *canon

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How to make money fast?

So I'm 13 years old and I'm saving up for a Canon or Nikon camera (preferably Canon) for photography. And I have about 150 dollars saved up right now, and I know the cheapest ones can be about 300. Are there any ways I could make money besides babysitting, house sitting, dog walking, pet sitting, or anything that has anything to do with neighbors? Because I just moved and I don't know anyone really well, and I don't feel comfortable with stuff like that. I used to babysit my neighbors child for 40$ a day and it was amazing, but unfortunately I had to move.
Thanks!

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What's wrong with my camera and how much will it cost to fix?

So in may 2012 i bought this nikon camera at best buy i didn't buy a warranty because it was too expensive all together. Anyways about a year later i was using it and it was working fine but suddenly it wouldn't turn on i assumed it was the batteries but when i got new ones it still didn't turn on then i pressed the play button to see pictures and it turned on but i wasn't able to take pictures or turn it on or off with the on button. It still looks new i always keep it in its protective case so it couldn't have gotten damaged if it accidentally knocked into something. So if someone has some ideas of what could be wrong and how much it will cost if it can be fix i would appreciate it, thanks.

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Can a Nikon D300s be used with Livestream?

Can a Nikon D300s be used with http://www.livestream.com/? If not, what camera [$200-300] would you recommend?

Thanks!

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How to get into video mode with my nikon d50 camera?

How to get into video mode with my nikon d50 camera?

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